- Run normal Minecraft 1.8.9 and once it reaches the title screen wait about 5 seconds and close it.
- Install Minecraft 1.8.9 forge from the forge website
- Once you click on the installer you'd like to download, a window will pop up. Do not click on anything in the middle of your screen; instead, click on the skip ad button towards the top right
- Open the installer, select install client, and click install
- When forge is installed, open the Minecraft launcher, go under the installations tab, click new installation, select the version release 1.8.9-forge1.8.9-11.15.1.xxxx (it will usually be all the way towards the bottom).
- Once you are done, run this new installation that you just created. Once it reaches the title screen, wait about 5 seconds and close it.
- Put all the Mods into the Mod Folder in your %appdata% Folder
- Start Minecraft and have fun